I. Place:

•  IN: Used for enclosed spaces, areas, or larger locations.
  •  Examples:
    *  "I live in London." (City)
    *  "The book is in the box." (Enclosed space)
    *  "There are many fish in the ocean." (Large area)
    * "She works in the marketing department." (Department within an organisation)

•  ON: Used for surfaces, streets, avenues, or specific floors.
  •  Examples:
    *  "The cat is on the roof." (Surface)
    *  "The store is on Main Street." (Street)
    *  "The office is on the third floor." (Floor)
    *  "Hang the picture on the wall." (surface)

•  AT: Used for specific points, addresses, buildings, or events.
  •  Examples:
    *  "Meet me at the corner." (Specific point)
    *  "I live at 123 Elm Street." (Address)
    *  "We are at the cinema." (Building)
    *  "I saw her at the party." (Event)

II. Time:

•  IN: Used for longer periods of time like centuries, decades, years, months, weeks, or general parts of the day.
  •  Examples:
    *  "The Renaissance occurred in the 15th century."
    *  "I was born in 1990."
    *  "I'll see you in June."
    *  "I like to read in the evening."
    *  "See you in a week."

•  ON: Used for specific days or dates.
  •  Examples:
    *  "I have a meeting on Monday."
    *  "My birthday is on July 4th."
    *  "See you on Christmas Day"

•  AT: Used for specific times of day or points in time.
  •  Examples:
    *  "The meeting starts at 9:00 AM."
    *  "See you at lunchtime."
    *  "I arrive at 11:30 AM."
    *  "At midnight."

III. Quick Summary Table:

| Preposition | Place            | Time               |
| :---------- | :-------------------------- | :------------------------------- |
| IN     | Enclosed spaces, areas, large places    | Centuries, decades, years, months, weeks, parts of the day |
| ON     | Surfaces, streets, avenues, floors     | Specific days, dates         |
| AT     | Specific points, addresses, buildings, events | Specific times, points in time    |

Important Considerations:

•  Exceptions: English is full of exceptions! These are general rules, but there will always be phrases or idioms that don't perfectly follow them.
•  Context: The best preposition to use depends heavily on the context of the sentence.

This note provides a basic framework for understanding "in," "on," and "at." Practice using them in sentences, and you'll become more confident in your choices.

1. I will meet you ___ the library.
2. My birthday is ___ July.
3. The cat is sleeping ___ the sofa.
4. The concert starts ___ 8 PM.
5. We live ___ 10 Downing Street.
6. I enjoy reading ___ the evening.
7. The picture is hanging ___ the wall.
8. I'll see you ___ Friday.
9. She works ___ a bank.
10. The store is located ___ Main Street and Elm Street.

Answer Key:

1. at
2. in
3. on
4. at
5. at
6. in
7. on
8. on
9. in
10. at

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A cube has a side length of 4 cm. If the side length is doubled, by what factor does the surface area increase?
  a) 2
  b) 4
  c) 6
  d) 8

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  a) 523.6 cm³
  b) 4188.8 cm³
  c) 1047.2 cm³
  d) 125.7 cm³